One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(6,8)(11,17)(15,18)(19,23)(22,24)(25,26,30,34)(27,33,37,31)(28,29,38,32)(35,36,40,39)(3,7)(6,8)(9,10)(11,18)(12,20)(13,14)(15,17)(16,21)(19,22)(23,24)(25,27,30,37)(26,31,34,33)(28,35,38,40)(29,39,32,36)(1,2,5,4)(3,6,7,8)(10,14)(15,18)(16,20)(22,24)(25,28,30,38)(26,29,34,32)(27,35,37,40)(31,39,33,36)(9,10)(11,15)(12,16)(13,14)(17,18)(19,22)(20,21)(23,24)(25,28)(26,32)(27,35)(29,34)(30,38)(31,36)(33,39)(37,40) involution — undirected(1,3,5,7)(2,6,4,8)(9,11,13,17)(10,15,14,18)(12,19,21,23)(16,22,20,24)(25,29,30,32)(26,28,34,38)(27,36,37,39)(31,40,33,35)(1,4,5,2)(3,8,7,6)(9,12)(10,16)(11,19)(13,21)(14,20)(15,22)(17,23)(18,24)(25,27)(26,33)(28,35)(29,36)(30,37)(31,34)(32,39)(38,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.